BOSTON -- Police are investigating possible hazing by an unsanctioned Boston University fraternity after officers responded to an off-campus apartment and found five men wearing just their underwear bound together at the wrists by duct tape.

Police say the men, all BU students, were covered with flour, coffee grounds, honey and other food and some had red welts on their skin. All refused medical treatment.

A Boston University spokesman says Alpha Epsilon Pi is not sanctioned by the school. The students involved could face punishment even though the incident occurred off campus.

BU has punished a sorority after three pledges were so drunk they needed medical treatment. Two members of the school's hockey team were accused of sexually assaulting women, and the independent student newspaper came under fire for a distasteful April's Fool's edition.